[luatex] LuaTeX precompilation

[Reinhard Kotucha]

On 2023-12-22 at 01:58:58 +0100, luigi scarso wrote:

 > On Fri, 22 Dec 2023 at 01:21, Reinhard Kotucha via luatex <luatex at tug.org>
 > wrote:
 >
 > > On 2023-12-21 at 10:27:48 +0100, Hans Hagen wrote:
 > >
 > >  > I stop here as I've written plenty about performance the last
 > >  > decades in various docs,
 > >
 > > Hi Hans,
 > > please let me mention this though:
 > >
 > > A few months ago I uncompressed the lualatex format file and
 > > compressed it with lz4.  The lz4-compressed file was smaller than the
 > > original format file.  Though I know that luatex doesn't use maximum
 > > gzip compression, I didn't really expect this.
 > >
 > >  26702648  lualatex.fmt-uncompressed
 > >  12201683  lualatex.fmt
 > >   9926586  lualatex.fmt.lz4
 > >
 > > But what I absolutely didn't expect is that de-compression of lz4
 > > files is about 7.5 times as fast as de-compression of the gzip'ed
 > > format file.
 > >
 > > In order to determine speed I directed the de-compressed output to
 > > /dev/null because when writing to disk results differ much more
 > > between successive runs and a format file is extracted in memory and
 > > not written to disk.
 > >
 > > Maybe it's worthwhile to keep an eye on lz4.
 > >
 > >
 > Good to know.  A quick search, just for the record:
 > https://manishrjain.com/compression-algo-moving-data
 >
 > But I think lz4 is better than zstd for a format.

Please note that I didn't try anything else but lz4.  There might be
other compressors worth to be considered nowadays.  I just tried lz4
because someone mentioned it at TUG-2023 (not in a talk but at
dinner).

Regards,
  Reinhard

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Reinhard Kotucha                            Phone: +49-511-3373112
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